The micro-structural character of limestone and its influence on the formation of phases in calcined products: natural hydraulic limes and cements

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F21%3A00547864" target="_blank" >RIV/68378297:_____/21:00547864 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1617/s11527-021-01814-7" target="_blank" >https://doi.org/10.1617/s11527-021-01814-7</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1617/s11527-021-01814-7" target="_blank" >10.1617/s11527-021-01814-7</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The micro-structural character of limestone and its influence on the formation of phases in calcined products: natural hydraulic limes and cements

Popis výsledku v původním jazyce

The properties of natural hydraulic binders are directly influenced by the composition of the raw materials used in their production. Depending on the specific composition and conditions in the kiln during burning, the process results in the transformation of the natural raw material and the formation of new phases based on chemical interactions between neighbouring mineral components (solid–state ion migration). A series of laboratory experiments was performed in order to compare the characteristics of various limestones with their properties, phase composition and phase-to-phase relationships after burning. The main objective was to thoroughly understand the relationship between the composition of the raw material and the characteristics of the burnt product. A set of 21 limestone samples were first characterised in terms of raw materials (including their chemical composition), and then individually burnt in an electrical furnace to obtain calcined products. Optical microscopy, SEM–EDS, and XRD-QPA were used to assess the micro-structural character of the material before and after calcination, identifying the relationships between the character and amount of the non-carbonate impurities, the size and character of the carbonate matrix, and the constituted phases. The results show that the chemical composition, expressed as the cementation index, can be used to predict the hydraulicity of calcined limes. However, for this to be reliably applied to an unknown limestone, an understanding of the petrographic characteristics is necessary. The paper demonstrates several different types of phase to phase relationships before and after calcination. It also points out the relation between the micritic and sparitic character of raw materials, and the hydraulicity of burnt products.

Název v anglickém jazyce

The micro-structural character of limestone and its influence on the formation of phases in calcined products: natural hydraulic limes and cements

Popis výsledku anglicky

The properties of natural hydraulic binders are directly influenced by the composition of the raw materials used in their production. Depending on the specific composition and conditions in the kiln during burning, the process results in the transformation of the natural raw material and the formation of new phases based on chemical interactions between neighbouring mineral components (solid–state ion migration). A series of laboratory experiments was performed in order to compare the characteristics of various limestones with their properties, phase composition and phase-to-phase relationships after burning. The main objective was to thoroughly understand the relationship between the composition of the raw material and the characteristics of the burnt product. A set of 21 limestone samples were first characterised in terms of raw materials (including their chemical composition), and then individually burnt in an electrical furnace to obtain calcined products. Optical microscopy, SEM–EDS, and XRD-QPA were used to assess the micro-structural character of the material before and after calcination, identifying the relationships between the character and amount of the non-carbonate impurities, the size and character of the carbonate matrix, and the constituted phases. The results show that the chemical composition, expressed as the cementation index, can be used to predict the hydraulicity of calcined limes. However, for this to be reliably applied to an unknown limestone, an understanding of the petrographic characteristics is necessary. The paper demonstrates several different types of phase to phase relationships before and after calcination. It also points out the relation between the micritic and sparitic character of raw materials, and the hydraulicity of burnt products.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/DG20P02OVV028" target="_blank" >DG20P02OVV028: Možnosti radiouhlíkového datování historických malt</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Materials and Structures

ISSN

1359-5997

e-ISSN

1871-6873

Svazek periodika

54

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

27

Strana od-do

217

Kód UT WoS článku

000717985000001

EID výsledku v databázi Scopus

2-s2.0-85119009315